Is this technically an illegal S trap?

It technically is an S shape not a P trap but it has he vacuum breaker on a t so I didn’t know if that’s why and it’s ok or if this is something I should write up. Thanks!!


It probably used to be. Now it’s just a funky/crappy drain. The waste arm length is greater than two pipe diameters so it would not be considered an “S” trap or crown vented. The AAV is too low.

Thanks guys!!

I don’t see anything wrong with that setup.

No, it isn’t.

Good graphics Mike. They allow those in Wisconsin?

Over here it depends on the building inspector.

Wisconsin is picky and does not allow all AAVs.